Pediatric
Malformation and related entities
Beckwith-Wiedemann syndrome

Author: Erdener Özer, M.D., Ph.D., Brad Wasserman, M.D. (see Authors page)

Revised: 16 October 2017, last major update November 2016

Copyright: (c) 2002-2017, PathologyOutlines.com, Inc.

PubMed Search: Beckwith-Wiedemann syndrome [title] pediatric
Cite this page: Özer, E., Wasserman, B. Beckwith-Wiedemann syndrome. PathologyOutlines.com website. http://pathologyoutlines.com/topic/pediatricbeckwith.html. Accessed October 22nd, 2017.
Definition / general
  • Beckwith-Wiedemann syndrome (BWS) is an overgrowth syndrome present at birth with certain congenital anomalies and increased risk of pediatric cancer (see OMIM: Beckwith-Wiedemann Syndrome [Accessed 16 October 2017])
  • Originally called exomphalos, macroglossia, gigantism syndrome by Dr. Hans-Rudolf Wiedemann in 1964; the combination of congenital anomalies was renamed Beckwith-Wiedemann syndrome by Prof. John Bruce Beckwith in 1969
Essential features
  • Macrosomia
  • Macroglossia
  • Visceromegaly
  • Embryonal neoplasms; mainly Wilms tumor and hepatoblastoma
  • Omphalocele / exomphalos
  • Adrenocortical cytomegaly
  • Renal abnormalities
  • Neonatal hypoglycemia
Terminology
  • Beckwith syndrome
  • Wiedemann-Beckwith syndrome
  • Exomphalos, macroglossia, gigantism (EMG) syndrome
ICD-10 coding
Epidemiology
  • Incidence of 1:13,700 births
  • Occurs in a variety of ethnic populations
  • M=F
Pathophysiology
  • J Hum Genet 2013;58:402
  • Epigenetic dysregulation of gene transcription within the BWS critical region (imprint domain) on chromosome 11p15 (sporadic):
    • Imprinting centers (IC1 and IC2) control gene expression across large chromosomal domains
    • Loss of methylation of IC2 (imprinting on the maternal chromosome (50%)
    • Paternal uniparental disomy of 11p15 (20%)
    • Gain of methylation of IC1 on the maternal chromosome (5%)
Etiology
  • Most individuals with BWS have normal chromosome studies or karyotypes
  • Children conceived by assisted reproductive technology (ART) may have an increased risk for imprinting disorders (Fertil Steril 2005;83:349)
  • Imprinted genes, including growth factors and tumor suppressor genes mapping to the 11p15 region, have been implicated
  • Duplication, inversion or translocation involving the p15.5 band of chromosome 11 are found in < 1% of affected individuals (familial)
  • Approximately 85% of reported BWS cases are sporadic, while the remaining 15% are familial (Am J Med Genet Semin Med Genet 2010;154C:343)
Clinical features
  • Eur J Hum Genet 2010;18:8
  • Macrosomia (height and weight > 97th percentile)
  • Macroglossia
  • Anterior linear ear lobe creases / posterior helical ear pits
  • Anterior abdominal wall defects
  • Visceromegaly involving liver, spleen, kidneys, adrenals and pancreas
  • Renal abnormalities (nephrocalcinosis, medullary sponge kidney, cystic changes, diverticula, nephromegaly)
  • Cytomegaly of fetal adrenal cortex (adrenocortical cytomegaly)
  • Embryonal neoplasms (Wilms tumor, hepatoblastoma, neuroblastoma, adrenocortical carcinoma, rhabdomyosarcoma)
    • Increased risk for neoplasia occurs in first eight years of life
    • This risk is evaluated between 7.5% and 10% (Arch Pediatr 2008;15:1498)
  • Hemihyperplasia (asymmetric overgrowth of one or more regions of the body)
    • May affect segmental regions of body or selected organs and tissues
    • Milder phenotypes may develop tumors associated with BWS
  • Pregnancy related findings include polyhydramnios and prematurity
Diagnosis
  • For all pregnancies at increased risk for BWS, whether or not the genetic mechanism is known:
    • Maternal serum alpha fetoprotein (AFP) concentration may be elevated at 16 weeks gestation in presence of an omphalocele
    • Obtain ultrasound at 19 - 20 and 25 - 32 weeks gestation to assess growth parameters, detect abdominal wall defects, visceromegaly, renal anomalies and macroglossia
  • Postnatal screening for embryonal neoplasms (Am J Med Genet 2016;170:2248, Eur J Med genet 2016;59:52):
    • Abdominal ultrasound examination every three months until age 8 years
    • Measure serum alpha fetoprotein (AFP) concentration every two to three months until age 4 years for early detection of hepatoblastoma (AFP serum concentration declines in postnatal period at slower rate than in healthy children and may be elevated in first year of life in BWS)
  • Low yield: screening for neuroblastoma with periodic chest Xray and urinary VMA and VHA
Radiology images

Images hosted on other servers:

CT scan of
abdomen showing
a cystic adrenal
lesion on the right

Transverse scan of the fetal head with macrocephaly

Fetal nephromegaly

3D representation
of the fetal ears:
ear lobe groove
suspected

Prognostic factors
  • Historical mortality rate of 20% but may now be improved
  • Early death may occur from complications of prematurity, hypoglycemia, cardiomyopathy, macroglossia or neoplasms
Case reports
Treatment
  • Directed toward the specific symptoms that are apparent in each individual
Clinical images

Images hosted on other servers:

Anterior linear crease

Posterior helical ear pits

Polydactyly of right hand and photo of ear with creases / pits

Case of BWS with an enlarged tongue and omphalocele

Gross description
Gross images

Images hosted on other servers:

Large lobulated adrenal glands

Placental mesenchymal dysplasia

Hepatomegaly and multilobulated liver

Placentomegaly

Enlarged placenta with multiple vesicles

Microscopic (histologic) description
  • Adrenal cytomegaly
    • Adrenal cortical cells with bizarre, enlarged polyhedral cells with granular eosinophilic cytoplasm and large, hyperchromatic nuclei with pseudoinclusions
  • Placental mesenchymal dysplasia
    • Dilated and thick walled chorionic plate vessels with fibromuscular hyperplasia
  • Hyperplasia of islets of Langerhans in the pancreas
  • Cystic tubules in the medullary region of the kidney
  • Hyperplasia of the interstitial cells in the ovary
  • Nephrocalcinosis
    • Diffuse tubular injury with atrophy, interstitial fibrosis and abundant tubular deposition of calcium phosphate
Microscopic (histologic) images

Images hosted on other servers:

Adrenocortical cytomegaly

Visceral anomalies in the fetus

Placental mesenchymal dysplasia

Placental histological anomalies